<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    *{
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body{
      background-color: #aaa;
      padding-top: 100px;
    }
    h1 {
      position: relative;
      font-size: 100px;
      color: #fff;
      text-align: center;
    }
    h1::before {
      content: 'DARK MODE';
      position: absolute;
      color: #000;
      transform: translate(-42px, 18px) scaleY(0.5) skew(50deg);
      z-index: -1;
      filter: blur(5px);
      mask-image: linear-gradient(transparent, #000);
    }
  </style>
</head>
<body>
  <h1>DARK MODE</h1>
</body>
</html>
